Removes the trailing slash in mpsd_release if present, instead of throwing an error and exiting.
We do write a warning that this is happening:
❯ mpsd-software install dev-23a/ foss2021a-mpi
[14:01:04] WARNING Removed trailing slash from release: dev-23a mpsd_software.py:1266
Release dev-23a is prepared in /home/karnada/Sandbox/Projects/mpsd-software-environments/dev-23a
Release dev-23a is prepared in /home/karnada/Sandbox/Projects/mpsd-software-environments/dev-23a
##### Setting up spack
Cloning into 'spack'...Closes #22 (closed)